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The last 7 posts

Find out which zones are constantly making the sound. Usually it will be
always 1 or 2 of the valves and maybe the master valve too if there is
one. Find and locate these valves and change the diaphragms.

Water hammer can be a major pain in the you know what. Sometimes it's simple to figure others it's a nightmare. All I know is the water hammer arrestors I've installed didn't do a dang bit of good. I've only installed two though because they didn't work.

woke up to hammering / oscillating pipes

I woke up early this morning to repeated hammering (oscillating?) of my 1994 home's copper pipes. Coincidentally, this is about the time the sprinkler system finished. I had to turn off the water supply to the house to get it to stop. Sprinkler system is 2 yrs old and has an RPZ installed. This has never happened before. Any ideas? Do I need to add a water hammer arrest device to the supply line for the sprinkler system? Before I do anything, I will run the sprinkler system again to try to get it to happen again.